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<script>
    // 题目1: 对字符串进行排列组合, 得到所有字符的全排列组合(假设所有字符不重复)
    // 函数名：permutation
    // 参数：需要排列组合的字符串
    // 返回值：字符串的所有排列组合数组
    // 例如：permutation("abc") 返回["abc", "acb", "bac", "bca", "cab", "cba"]
    function permutation(str) {
        let arr = [];
        let s;
        arr.push(str);
        for (let i = 0; i < str.length; i++) {
            if (s != undefined) {
                arr.push(s);
            }
            s = str.split("");
            s.reverse();
            s = s.join("");
            arr.push(s);
            s = s.split("");
            s.push(s[0]);
            s.shift();
            s = s.join("");
        }
        return arr;
    }
    console.log(permutation("abc"));
</script>